I have noticed that if you make an item with a +X Bonus to Int, you do not get any extra skill points.

Headbands work fine - as you get a the 'BONUS:ABILITYPOOL|Headband of Intellect Skill Choice|1' tag. I believe it is true that you cannot double up. However, without this tag shouldn't you get points to spend as you please?

It's a D&D 3.x/Pathfinder rule (and maybe a d20 general rule) that bonus to Intelligence items don't give skill ranks. If you (or your GM, if that's not you) want it to work differently, there are ways it can be done. How depends on exactly how and when you want the skill points available.

Nylanfs wrote:Actually that is only a Pathfinder rule i believe. In 35e they would give a bonus to future class selections.

Unfortunately, it's not the case in 3.5, either. (Emphasis added.)

3.5 SRD wrote:This device is a light cord with a small gem set so that it rests upon the forehead of the wearer. The headband adds to the wearer’s Intelligence score in the form of an enhancement bonus of +2, +4, or +6. This enhancement bonus does not earn the wearer extra skill points when a new level is attained; use the unenhanced Intelligence bonus to determine skill points.